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   4 <title>Class has_attribute&lt;void&gt;</title>
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  21 <h2><span class="refentrytitle">Class has_attribute&lt;void&gt;</span></h2>
  22 <p>boost::log::expressions::has_attribute&lt;void&gt;</p>
  23 </div>
  24 <h2 xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv-title">Synopsis</h2>
  25 <div xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="refsynopsisdiv"><pre class="synopsis"><span class="comment">// In header: &lt;<a class="link" href="../../../expressions.html#header.boost.log.expressions.predicates.has_attr_hpp" title="Header &lt;boost/log/expressions/predicates/has_attr.hpp&gt;">boost/log/expressions/predicates/has_attr.hpp</a>&gt;
  26
  27 </span>
  28 <span class="keyword">class</span> <a class="link" href="has_attr_idm45711347224064.html" title="Class has_attribute&lt;void&gt;">has_attribute</a><span class="special">&lt;</span><span class="keyword">void</span><span class="special">&gt;</span> <span class="special">{</span>
  29 <span class="keyword">public</span><span class="special">:</span>
  30   <span class="comment">// types</span>
  31   <span class="keyword">typedef</span> <span class="keyword">bool</span> <a name="boost.log.expressions.has_attr_idm45711347224064.result_type"></a><span class="identifier">result_type</span><span class="special">;</span>  <span class="comment">// Function result_type. </span>
  32   <span class="keyword">typedef</span> <span class="keyword">void</span> <a name="boost.log.expressions.has_attr_idm45711347224064.value_type"></a><span class="identifier">value_type</span><span class="special">;</span>   <span class="comment">// Expected attribute value type. </span>
  33
  34   <span class="comment">// <a class="link" href="has_attr_idm45711347224064.html#boost.log.expressions.has_attr_idm45711347224064construct-copy-destruct">construct/copy/destruct</a></span>
  35   <span class="keyword">explicit</span> <a class="link" href="has_attr_idm45711347224064.html#idm45711347210816-bb"><span class="identifier">has_attribute</span></a><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span><span class="special">;</span>
  36
  37   <span class="comment">// <a class="link" href="has_attr_idm45711347224064.html#idm45711347220160-bb">public member functions</a></span>
  38   <span class="identifier">result_type</span> <a class="link" href="has_attr_idm45711347224064.html#idm45711347219600-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">attribute_value_set</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  39   <span class="identifier">result_type</span> <a class="link" href="has_attr_idm45711347224064.html#idm45711347215280-bb"><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span></a><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><span class="special">::</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span><span class="special">)</span> <span class="keyword">const</span><span class="special">;</span>
  40 <span class="special">}</span><span class="special">;</span></pre></div>
  41 <div class="refsect1">
  42 <a name="idm45554740658016"></a><h2>Description</h2>
  43 <p>An attribute value presence checker. This specialization does not check the type of the attribute value. </p>
  44 <div class="refsect2">
  45 <a name="idm45554740657216"></a><h3>
  46 <a name="boost.log.expressions.has_attr_idm45711347224064construct-copy-destruct"></a><code class="computeroutput">has_attribute</code>
  47         public
  48        construct/copy/destruct</h3>
  49 <div class="orderedlist"><ol class="orderedlist" type="1"><li class="listitem">
  50 <pre class="literallayout"><span class="keyword">explicit</span> <a name="idm45711347210816-bb"></a><span class="identifier">has_attribute</span><span class="special">(</span><span class="identifier">attribute_name</span> <span class="keyword">const</span> <span class="special">&amp;</span> name<span class="special">)</span><span class="special">;</span></pre>
  51 <p>Initializing constructor</p>
  52 <p>
  53 </p>
  54 <div class="variablelist"><table border="0" class="variablelist compact">
  55 <colgroup>
  56 <col align="left" valign="top">
  57 <col>
  58 </colgroup>
  59 <tbody><tr>
  60 <td><p><span class="term">Parameters:</span></p></td>
  61 <td><div class="variablelist"><table border="0" class="variablelist compact">
  62 <colgroup>
  63 <col align="left" valign="top">
  64 <col>
  65 </colgroup>
  66 <tbody><tr>
  67 <td><p><span class="term"><code class="computeroutput">name</code></span></p></td>
  68 <td><p>Attribute name </p></td>
  69 </tr></tbody>
  70 </table></div></td>
  71 </tr></tbody>
  72 </table></div>
  73 </li></ol></div>
  74 </div>
  75 <div class="refsect2">
  76 <a name="idm45554740644960"></a><h3>
  77 <a name="idm45711347220160-bb"></a><code class="computeroutput">has_attribute</code> public member functions</h3>
  78 <div class="orderedlist"><ol class="orderedlist" type="1">
  79 <li class="listitem">
  80 <pre class="literallayout"><span class="identifier">result_type</span> <a name="idm45711347219600-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">attribute_value_set</span> <span class="keyword">const</span> <span class="special">&amp;</span> attrs<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
  81 <p>Checking operator</p>
  82 <p>
  83
  84 </p>
  85 <div class="variablelist"><table border="0" class="variablelist compact">
  86 <colgroup>
  87 <col align="left" valign="top">
  88 <col>
  89 </colgroup>
  90 <tbody>
  91 <tr>
  92 <td><p><span class="term">Parameters:</span></p></td>
  93 <td><div class="variablelist"><table border="0" class="variablelist compact">
  94 <colgroup>
  95 <col align="left" valign="top">
  96 <col>
  97 </colgroup>
  98 <tbody><tr>
  99 <td><p><span class="term"><code class="computeroutput">attrs</code></span></p></td>
 100 <td><p>A set of attribute values </p></td>
 101 </tr></tbody>
 102 </table></div></td>
 103 </tr>
 104 <tr>
 105 <td><p><span class="term">Returns:</span></p></td>
 106 <td><p><code class="computeroutput">true</code> if the log record contains the sought attribute value, <code class="computeroutput">false</code> otherwise </p></td>
 107 </tr>
 108 </tbody>
 109 </table></div>
 110 </li>
 111 <li class="listitem">
 112 <pre class="literallayout"><span class="identifier">result_type</span> <a name="idm45711347215280-bb"></a><span class="keyword">operator</span><span class="special">(</span><span class="special">)</span><span class="special">(</span><span class="identifier">boost</span><span class="special">::</span><span class="identifier">log</span><span class="special">::</span><span class="identifier">record_view</span> <span class="keyword">const</span> <span class="special">&amp;</span> rec<span class="special">)</span> <span class="keyword">const</span><span class="special">;</span></pre>
 113 <p>Checking operator</p>
 114 <p>
 115
 116 </p>
 117 <div class="variablelist"><table border="0" class="variablelist compact">
 118 <colgroup>
 119 <col align="left" valign="top">
 120 <col>
 121 </colgroup>
 122 <tbody>
 123 <tr>
 124 <td><p><span class="term">Parameters:</span></p></td>
 125 <td><div class="variablelist"><table border="0" class="variablelist compact">
 126 <colgroup>
 127 <col align="left" valign="top">
 128 <col>
 129 </colgroup>
 130 <tbody><tr>
 131 <td><p><span class="term"><code class="computeroutput">rec</code></span></p></td>
 132 <td><p>A log record </p></td>
 133 </tr></tbody>
 134 </table></div></td>
 135 </tr>
 136 <tr>
 137 <td><p><span class="term">Returns:</span></p></td>
 138 <td><p><code class="computeroutput">true</code> if the log record contains the sought attribute value, <code class="computeroutput">false</code> otherwise </p></td>
 139 </tr>
 140 </tbody>
 141 </table></div>
 142 </li>
 143 </ol></div>
 144 </div>
 145 </div>
 146 </div>
 147 <table xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" width="100%"><tr>
 148 <td align="left"></td>
 149 <td align="right"><div class="copyright-footer">Copyright &#169; 2007-2016 Andrey Semashev<p>
 150         Distributed under the Boost Software License, Version 1.0. (See accompanying
 151         file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>).
 152       </p>
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